Rotary compressor



Patented Sept. 13, 1921.

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G. B. PETSCHE.

ROTARY COMPRESSOR.

APPLICATION FILED OCT. 28, 1920.

A T'TORNE Y I UNITED STATES GUSTAV B. PETSCHE, OF YON'KERS, NEW YORK.

ROTARY COMPRESSOR.

Specification of Letters Patent.

PatentedSept. 13, 1921.

Application" filed October 28, 1920. Serial No. 420,082.

To all whom it may concern Be it known that I, GUs'rAv B. PE'rsoHE, a citizen of the United States of America, and resident of Yonkers, in the county of Westchester, in the State of New .York, have invented a certain new and useful Improvement in Rotary Compressors, of which the following is a true and exact description, reference being had to the accompanying drawings, which form -a part thereof.

My invention relates to rotary compressors and has for its object to provide for the cooling of the compressed gas delivered from the compressor and for the cooling and re-use of the lubricating oil used in the rotary compressor in large quantity, in a separate oil cooler located at a lower level than the gas cooler, and for the re-use of the cooled oil which can be cooled to such a point that it will absorb a portion of the heat generated by compression and thus lower the temperature of the compressed gases, particularly, though not exclusively, my invention relates to compound rotary compressors having such dimensions that, assuming but two compounded compressors to be used, the secondary compressor will.

have such capacity and dimensions that it will act upon an equal weight of gas to that acted upon by the first compressor.

My invention has also to do with various details of construction and will be best understood as described in connection with the drawings in which my invention is illustrated in what I believe to be its best and most advantageous form and in which- I pressors, not formed in the same casting,

can be conveniently combined with operative and inter-cooling mechanism.

A and A are the two compressors formed, as shown in Figs. 1, 2 and 3, in a single castin and provided with face plates A and The capacities of the two com pressors are made such that the second compressor A will contain and act upon the same weight of gas as is contained and acted upon by the first compressor A. B and B indicate the cylindrical interiors of the two compressing cylinders; B and B indicatlng the points at which the cylindr-i cal surfaceof the compressor A is cut away to give clearance to the piston extension,

12 and b indicating two similar clearances provided in the cylinder A. C and C indicate bearing surfaces for a swivel block. E is the admission chamber-of the compressor A. F the delivery chamber of this compressor. F is an oil receiving chamber smaller compressor extends. G is the intercooler connectlng, as shown, with the delivery passage F of the compressor A and with the admission chamber E of the compressor A. H is the driving shaft to which are secured the eccentrics H and H on which work the eccentric. ring pistons indicated at I and I, said'pistons being provided with extensions J and J which, as illustrated, are made in a form of slides working in swivel blocks K and K seate in the bearings C and C. As shown the admission to the compressors is through passages J 7' and ports J j in the respective extensions J and J a feature of construction covered by my co-pending application filed October .6, 1920, Serial No. 415,145, C and 0 indicate delivery ports formed in the bearing surface C and C and opening into the delivery chambers F and F. The port C as shown, opens into the oil chamber F at the bottom of chamber F. K and 76 indicate ports formed in the swivel blocks K, K so formed and proportioned as to enable the swivel blocks to act as valves to open and close the ports C 0 at proper time's. a i

In the modification shown in Fi 4 AA indicates the larger compressor, A the smaller compressor. HH indicates the driving shaft for both compressors and L a motor acting on the driving shaft between the two compressors. (3G indicates the incooler.

M is an oil pipe leading from opening F,

of the oil chamber F to an oil cooler made up, as shown, of oil pipes M' passing through a water chamber N. The 011 pass-- hand side of the piston has come in contact I with the periphery of the cylinder at B The delivery of port C is closed by a swivel block K during the motion of the piston from the beginning of its operative cycle until it reaches the position shown in Fig. 1 after which thefurther motion of the piston and of the swivel block opens this port and permits the delivery of the gas through the chamber F and inter-cooler Gr.

The operation of the compressor A is, as shown, precisely similar to that of the compressor A but the capacity of the cylinder A is so reduced that the amount of compressed gas upon wh h it acts during each cycle will be equal in weight to, the gas acted on by the cylinder A and the gas having been deprived of its heat of compression by passing through the inter-cooler the compounded compressors will work with the highest degree of efiiciency.

Oil in considerable quantity is fed into the admission chamber E and enters the first compressor with the gas and fills the clearance spaces of the compressor. The oil is forced out of the port C into the oil well F and passes through pipe M and cooler M N to pipe M by which it is delivered into oil well E and thence it passes through the admission port j? in slide J into the smaller compressor being, of course, forced out of delivery port 0 into the receiver F where it can be separated from the gas and recooled again for reuse.

The gas inter-cooler may be of any kind or construction and cooling of the gas, of course, occurs by radiation or conduction from the compressors and is greatly aided by'the use of oil in considerable quantity where my means are employed for cooling the oil before reuse in a separate cooler in which the oil can be cooled to a low tern.- perature and which avoids the impairment of the efficiency of the gas cooler which reraeoeee compressed gas from the first compressor before its entrance into the second compressor, an oil receiving chamber at the delivery port of the larger compressor, a separate oil cooler connected .to said chamber and located at a lower level than the gas cooler and a conduit leading from said cooler to the admission side of the smaller compressor.

2. A compound compressor comprising a rotary compressor in combination with a second rotary compressor connected to receive and act upon the compressed gas from the first compressor and of such smaller capacity as will receive a substantially equal weight of gas, an intercooler for cooling the compressed gas from the first compressor before its entrance into the second compres-' sor, an oil receiving chamber at the delivery port of the larger compressor, a separate oil cooler connected to said chamber and located at a lower level than the gas cooler and a conduit leading from said cooler to the admission port of the smaller compressor.

3. A compound compressor comprising a;

rotary compressor in combination with a second rotary compressor connected to re ceive and act upon the compressed gas from the first compressor and of such smaller capacity as will receive a substantially equal weight of gas in compressed condition, said second compressor having a piston extension forming a partition between the admission and exhaust ports and an admission port formed in said extension, an intercooler for cooling the gas from the first compressor, having an oil well into which the ported upper end of the piston extension of the second compressor extends, an oil receiving chamber at the delivery port of the larger compressor, a separate oil cooler connected to said chamber and located at a lower level than the gas cooler and a conduit leading from said cooler to the oil well in the gas inter-cooler.

GUSTAV B. PETSCHE. 

